Foundrymen have maken a lot of research works to shrinkage and dispersed shrinkage, and gained important success during the past few years.

多年来，铸造科技工作者对缩孔和缩松进行了大量研究工作并取得重要成果。

youdao

Foundrymen have maken a lot of research works to shrinkage and dispersed shrinkage, and gained important success during the past few years.

多年来，铸造科技工作者对缩孔和缩松进行了大量研究工作并取得重要成果。

youdao